Combined dividing and multiplying machine



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van-a INVENTOR ATTORNEY Patented Mar. 6, 1945' COMBINE-D DIVIDING ANDMULTIPLYING MACHINE James W. Bryce, Glen Ridge, N. J., lassgnor 'toInternational Business Machines Corporation, New York, N. Y., acorporationof New York Application Jury 12, 1944,seria1 N0.'544,4s6

s claims. (ci. asse-61.8)

This invention relates generally to calculating machines `which areprovided with both multiplying `and dividing mechanisms and particularlyto the type of ymachine wherein the result of the computation secured bythe operation of the .dividing rnechanismis checked by a multiplyingcomputation performed by the multiplying mechanism. Thechecking of suchcomputations is particularly useful and advantageous'in recordcontrolled machines wherein the computation result is recorded upon therecord containing the original factors and since the accuracy of thecomputation result is vital in the accountw ing system in which theresults of the computations Aare utilized, ythe checking operations arenecessary and particularly desirable inaccounting systems where extremeaccuracy in results is required. i y

This application is a continuation in part of ,application Serial No.519,721, filed January 26, 1944, which latter is a kdivisionofyapplication Serial No. 430,324, yfiled February 11, 1942. Claimsherein are directed to the feature of checking the quotient results of adividing computation by a multiplying computation without re-running thecard. controlling the division computation through the machine.

According to ,arrangements previously devised, it was proposed in PatentNo. 2,343,399, dated March '7, 1944 to provide a machine which wouldenable a computation to be performed by a dividing mechanism to secure aquotient result, and record the result .onthe card. It was propo-sed tohavethe factors of the computation, namely the dividend and divisor forthe computation of division, ytogether' withthe recorded quotient resultytaken from the card,.then keffect the subsequent multiplyingcomputation by reerunning the card through the machine. The change forthe recomputation could not be effected automatically and requiredreconditioning of the machine for the recomputation by manual inter-`vention which consisted primarily of replug ging. By the provision ofsuitable checking devices, the correctness of the recorded quotient L itrequired the freperforating of -a ,card for the factors of thecomputation.

It is also contemplatedin Patent No. 2,206,218 to R, Blakely, datedvJuly `2, y1940 to provide a machine which Will check the product resultof a multiplying com-putation by a subsequent recomputation of the sametype without, however,

requiring thatl the product resultbe rrecorded and the cards. be re-runthrough the machine.` lCheckingldev'ices were also provided to check thenewly acquired product-before it is recorded upon the card, againstthesubsequently derived prod,- uct result. Upon agreement, productrecording would then ensue and by this arrangement, the reperforating ofa 4card upon locating an incorrectly derived `product was avoided.However,

the recomputation for checking purposes was performed bythe same type'ofcomputation, that is, an original multiplying operation wasautomaticallyfollowed by a subsequent multiplying operation.l While, asstated in'this patent, checking multiplying yisetfected with the factorentry relations reversedso as .to-provide different operations `of'thercomputing mechanisms involved,

vnevertheless there arevrnechanisms rwhich are commonly operated for theoriginal and 4subsequentcomputation inthe same way, and furthermore, thechecking 'or the originally derived product against the lnewly computedproduct does not provide for the extreme 'accuracy required in checking.

Accordingly, the' present inventionprovides to overcome thedisadvantages of the previous arrangements by automatically effecting are- -computation by a multiplying computation and since some of the samecalculating mechanisms a multiplying computation under control of one ofthe factors for theoriginal computation and the previously derivedquotient result. More specifically, it is an object ofthe invention toprovide an arrangement-,fof the type ius't described with checkingdevices` which will de-

